If you're an avid racer or have a lot of hills to climb, this is a great addition to the Ruckus. The same hills that used to slow me down to 40 km/h, now I'm climbing at 35 km/h. I did notice a slight 1-2mph drop in top speed, but the increase in low-to-midrange performance was worth it. My top speed improved after some time resting on the spring. (I rule the blue source)
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